B. Operating Performance Checks
Table 3.4 (Continued) Required Calibration Equipment
Item
MOHR part number
Connector, SMA male to BNC female
CT100-AC-ISMBF
Shorting cap
CT100-AC-ISS
50 Ω 36 in. reference cable
CT100-AC-W536-S
Additionally, a device capable of taking accurate pulse measurements with documented
calibration will be required, and, if working with a CT100B [BNC], an open terminator will be
needed. Coaxial adapters with low TDR reflections (
<
5Ω) are required in any cases where
adapters are used.
B.3. Getting Ready
Disconnect any cables from the front BNC or SMA connector. Connect the instrument to the
external 24V power supply connected to a standard 3-prong AC source.
Allow the unit to warm up until it displays a steady temperature.
B.4. Operator Performance Checks
B.4.1
Jitter, Noise, Rise Time, and Sampling Efficiency Checks
1. Connect a 50 ohm terminator to the CT100B front panel cable connector.
2. Select the
MENU
→
Settings
→
Diagnostics
menu item to enter the
Diagnostics
submenu.
3. Select
Jitter
. After a moment, a results window appears with a list of measurements.
The value for Jitter used in the specification for a CT100B is Jitter P2P. The value for Noise is
Noise P2P.
The value for the 20-80% and 10-90% Reflected Rise Times are both displayed as 20-80 Rise and
10-90 Rise, respectively.
B.4.2
Output Impedance Check
1. Disconnect any cables from the CT100B front panel cable connector.
2. Position a cursor before the falling edge of the trace.
3. Position the second cursor well beyond the falling edge.
4. Attach the 50 ohm terminator to the CT100B.
5. The difference in ohms between the two cursors is a measure of the deviation of output
impedance from 50 ohms.
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CT100B TDR Cable Analyzers Operator’s Manual
